Sturgeon's Law

Sturgeon's Law /prov./ "Ninety percent of everything is
crap". Derived from a quote by science fiction author Theodore
Sturgeon, who once said, "Sure, 90% of science fiction is crud.
That's because 90% of everything is crud." Oddly, when Sturgeon's
Law is cited, the final word is almost invariably changed to
`crap'. Compare Hanlon's Razor, Ninety-Ninety Rule.
Though this maxim originated in SF fandom, most hackers recognize
it and are all too aware of its truth.